(AMT)

Role: Former Director
Signature: /s/ Marina A. Breed, as attorney-in-fact
Issuer symbol: AMT
Transactions as of: 14 May 2025
Net transactions value: $0
Form type: 4
Filing time: 16 May 2025, 15:04:27 UTC
Previous filing: 12 Mar 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
REED JOANN A	Former Director	116 HUNTINGTON AVENUE, BOSTON	/s/ Marina A. Breed, as attorney-in-fact	16 May 2025	0001252013

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	AMT	Common Stock						62,940	14 May 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Joann A. Reed is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Remarks:

JoAnn A. Reed did not stand for re-election at the issuer's 2025 Annual Meeting of Stockholders. Accordingly, effective May 14, 2025, Ms. Reed is no longer a director of the issuer.